The previous code disabled some animations on Symbian. However,
these animations are smooth on Symbian^3, so we changed the verification,
made in two steps:
- Is it Symbian? (in compile time, i.e., #ifdef Q_OS_SYMBIAN)
- Is it S60 5th ed FP2? (in runtime, using QSysInfo::s60Version)

Q: Why not check QSysInfo::symbianVersion?
A: Because this method in Qt 4.6.3 (the Symbian^3 default) does not return the
Symbian^3 enum value (SV_SF_3). In Qt 4.7, it does.

Q: Why check for S60 5th ed FP2?
A: Tests showed Qt 4.6.3 QSysInfo::s60Version returns SV_S60_5_2, the enum value of
S60 5th ed FP2. If you check the Qt 4.7 docs (and code!) you are going to find that
SV_S60_5_2 == SV_SF_3, the Symbian^3 identifier. So, using this enum value, our check
works now with Qt 4.6.3 and we are safe when Symbian^3 updates Qt to 4.7.